311243013 has 16 divisors (see below), whose sum is σ = 472348800. Its totient is φ = 202433760.

The previous prime is 311243011. The next prime is 311243029. The reversal of 311243013 is 310342113.

It is not a de Polignac number, because 311243013 - 2¹ = 311243011 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311243011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 139473 + ... + 141686.

It is an arithmetic number, because the mean of its divisors is an integer number (29521800).

Almost surely, 2^311243013 is an apocalyptic number.

It is an amenable number.

311243013 is a deficient number, since it is larger than the sum of its proper divisors (161105787).

311243013 is a wasteful number, since it uses less digits than its factorization.

311243013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281209 (or 281203 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 311243013 is about 17642.0807446287. The cubic root of 311243013 is about 677.6933181080.

Adding to 311243013 its reverse (310342113), we get a palindrome (621585126).

The spelling of 311243013 in words is "three hundred eleven million, two hundred forty-three thousand, thirteen".